An in-situ crystallization catalyst, its production line and preparation method

Abstract

The present application relates to an in-situ crystallization catalyst and its production line and preparation method. The production line includes a spray box and a drying box. Several spray modules are arranged on the top of the spray box. The spray modules include: a spray disk; a first nozzle, which is located in the center of the spray disk and delivers an additive slurry at high pressure; a second nozzle, which is provided in multiple locations and located at the edge of the spray disk. Kaolin slurry is delivered at high pressure in the second nozzle, and the spray direction of the second nozzle is obliquely pointed at the optimal spray diffusion layer of the first nozzle; a first annular electrode, an insulating ring, which is located at the mist outlet of the second nozzle; a spring electrode, an insulating sleeve, which is located at the mist outlet of the first nozzle; and an electrostatic generator for outputting high-voltage charges of different polarities to the first annular electrode and the spring electrode, respectively. By applying charges of opposite polarity to the additive droplets and the kaolin droplets, the present application can improve the mixing efficiency and uniformity of the two while ensuring the mixing ratio of the two.

Description

Technical Field

[0001] The present application relates to the technical field of industrial catalysis, and in particular to an in-situ crystallization catalyst and its production line and preparation method. Background Art

[0002] In-situ crystallization catalysts are produced using in-situ crystallization technology, in which the active components of the catalyst are directly crystallized and grown on a specific support material under controlled conditions, forming a catalyst with a specific crystal structure and catalytic function. This catalyst is characterized by a tight bond between the active components and the support, which can improve the catalyst's stability and catalytic efficiency.

[0003] In the related technology, the Chinese patent application number CN202111502789.7 proposes a heavy oil-type in situ crystallization catalyst. The kaolin microsphere raw material for preparing the catalyst contains a silicon-aluminum material. The silicon-aluminum material has a pseudo-boehmite structure. Its anhydrous chemical expression is: (0-0.2)Na2O: (4-30)SiO2: (70-96)Al2O3, calculated by oxide weight. It has a double pore distribution of 2-40n in situ crystallization catalyst production line and 70-300n in situ crystallization catalyst production line, a specific surface area greater than 500 and not more than 650 in situ crystallization catalyst production line 2 / g, a pore volume of 2.1-2.8 in situ crystallization catalyst production line l / g, and a ratio of pyridine infrared B acid amount to L acid amount measured at 200°C is 0.10-0.38. The preparation method is as follows: (1) preparing an in-situ crystallization product from kaolin microspheres; using kaolin as a raw material, adding deionized water and silicon-aluminum materials, spray drying the prepared mixed slurry to obtain kaolin spray microspheres, and then calcining the slurry, mixing with a silicon source, an alkaline solution, and a directing agent for crystallization, filtering, washing, and drying the filter cake to obtain an in-situ crystallization product; the amount of silicon-aluminum materials added is 1 to 10% of the mass of kaolin, preferably 2 to 8%; (2) exchanging and calcining the in-situ crystallization product to prepare an in-situ crystallization catalyst; exchanging and calcining the in-situ crystallization product with one or more of ammonium salts, rare earths, or phosphorus to obtain an in-situ crystallization catalyst.

[0004] When preparing kaolin spray microspheres, additives are generally added to the kaolin slurry, such as structural additives based on starch, graphite powder, or carboxymethyl cellulose, which can improve the pore structure of the kaolin spray microspheres after drying and forming; or binders based on sodium silicate, silica sol, aluminum sol, pseudo-boehmite, etc., and the amount of these additives added is generally about 10% to 25% of the mass of the kaolin. However, in the current preparation process, these raw materials are usually directly mixed to prepare the slurry. The kaolin particle size selected is 2.5 to 3.5μ. In the in-situ crystallization catalyst production line, a long mixing time is required to ensure that the additives in the kaolin slurry are fully mixed. Moreover, the addition of the binder further reduces the efficiency of this uniform mixing. Summary of the Invention

[0005] In order to improve the problem of low uniform mixing efficiency of kaolin and additives in kaolin slurry, the present application provides an in-situ crystallization catalyst and its production line and preparation method.

[0006] The first aspect of the present application provides an in-situ crystallization catalyst production line adopting the following technical solution:

[0007] An in-situ crystallization catalyst production line includes a microsphere spray device and a drying box. The microsphere spray device includes a spray box connected to the drying box. The top of the spray box is provided with a plurality of spray modules. The spray modules include:

[0008] A spray plate is installed on the top of the spray box;

[0009] A first nozzle is provided at the center of the spray disc and is connected to a first slurry pipe, wherein the first slurry pipe conveys the additive slurry at high pressure;

[0010] a second nozzle, provided in plurality and located at the edge of the spray disk, the plurality of second nozzles being distributed in an equally spaced circular array about the central axis of the spray disk, the second nozzle being connected to a second slurry pipe, in which kaolin slurry is transported at high pressure, and the spray direction of the second nozzle being obliquely directed toward the optimal spray diffusion layer of the first nozzle;

[0011] The first annular electrode and the insulating ring are arranged at the mist outlet of the second nozzle.

[0012] a spring electrode, an insulating sleeve being arranged at the mist outlet of the first nozzle; and

[0013] The electrostatic generator is used to output high-voltage charges of different polarities to the first annular electrode and the spring electrode respectively.

[0014] Furthermore, the spring electrode is configured as a conical coil spring, and its minimum inner diameter end is larger than the outer diameter of the first nozzle, and its maximum inner diameter is smaller than the diffusion diameter of the first nozzle at its optimal spray diffusion layer.

[0015] Furthermore, the axial length of the spring electrode is smaller than the distance between the mist outlet of the first nozzle and its optimal spray diffusion layer.

[0016] Furthermore, the spray basin is provided with a vibration unit for applying a vibration frequency close to the resonant frequency of the spring electrode to the spring electrode.

[0017] Furthermore, the spray box is provided with a second annular electrode corresponding to the optimal spray diffusion layer of the first nozzle, the inner diameter of the second annular electrode is larger than the outer diameter of the spray disk, and the second annular electrode is connected to the electrostatic generator and outputs a high-voltage charge with the same polarity as the high-voltage charge on the first annular electrode by the electrostatic generator.

[0018] Furthermore, the spray diffusion angle of the second nozzle is smaller than the spray diffusion angle of the first nozzle.

[0019] Furthermore, the first annular electrode is in a conical shape, and its closing end is close to the second nozzle.

[0020] Furthermore, the joint between the spray box and the drying box is provided with an air guide cone with a closed end extending into the drying box.

[0021] The second aspect of the present application provides a method for preparing an in-situ crystallization catalyst using the following technical solution:

[0022] A method for preparing an in-situ crystallization catalyst, based on the above-mentioned in-situ crystallization catalyst production line, comprises the following steps:

[0023] S1. The kaolin is mixed with deionized water to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry;

[0024] S2. Passing the kaolin slurry under high pressure into the plurality of second nozzles, and passing the additive slurry under high pressure into the first nozzle, controlling the spray flow rate ratio of the plurality of second nozzles to the first nozzle according to the ratio of kaolin to additive, preparing kaolin spray microspheres in the spray box, drying them in the drying oven, calcining them, and crystallizing them by mixing with a silicon source, an alkaline solution, and a directing agent. The filter cake is filtered, washed, and dried to obtain an in-situ crystallized product;

[0025] S3. exchanging and calcining the in-situ crystallization product with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

[0026] The third aspect of the present application provides an in-situ crystallization catalyst using the following technical solution:

[0027] An in-situ crystallization catalyst is prepared by the above-mentioned in-situ crystallization catalyst preparation method.

[0028] In summary, the beneficial technical effects of this application are:

[0029] 1. When preparing kaolin spray microspheres, kaolin and deionized water are first uniformly mixed to form a kaolin slurry, and then various additives with a set ratio are mixed with deionized water to form an additive slurry. The kaolin slurry is passed into multiple second slurry pipes at high pressure, and the additive slurry is passed into the first slurry pipe at high pressure. The flow rates of the droplets sprayed from the first nozzle and the second nozzle are controlled by the first flow solenoid valve and the second flow solenoid valve, so that when the first nozzle sprays the additive slurry, the multiple surrounding second nozzles also spray the kaolin slurry, so that efficient mixing can be achieved while ensuring the ratio of the additive slurry and the kaolin slurry.

[0030] 2. When the electrostatic generator is working, it outputs high-voltage positive charge to the first annular electrode and high-voltage negative charge to the spring electrode, which can make the additive droplets sprayed from the first nozzle negatively charged and the kaolin droplets sprayed from the second nozzle positively charged. In this way, the additive droplets and kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and additives; and because the two are mixed in the form of droplets, it can also greatly promote the mixing uniformity of the two.

[0031] 3. By configuring the spring electrode as a conical coil spring, so that its cone shape is close to the diffusion pattern of the additive droplets ejected from the first nozzle, the spring electrode can charge the additive droplets more evenly. At the same time, by applying high-frequency vibration to the spring electrode with the help of a vibration unit, the spring electrode can not only charge the additive droplets, but also further add oblique kinetic energy to the additive droplets, thereby improving the uniformity of the additive droplets. The additive droplets have sufficient kinetic energy to diffuse toward the surrounding side, thereby further promoting the capture and bonding of the additive droplets with the surrounding kaolin droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of the overall structure of an embodiment of the present application;

[0033] Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A.

[0034] Description of reference numerals:

[0035] 1. Drying oven;

[0036] 2. Spray box;

[0037] 3. Spray disk; 311. First nozzle; 312. First slurry pipe; 321. Second nozzle; 322. Second slurry pipe;

[0038] 41. First annular electrode; 42. Second annular electrode;

[0039] 51. Spring electrode; 52. Vibration unit;

[0040] 6. Static electricity generator;

[0041] 7. Air guide cone;

[0042] 81. First flow solenoid valve; 82. Second flow solenoid valve;

[0043] 9. Insulated wall. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0045] The present application discloses an in-situ crystallization catalyst production line. Figure 1 and Figure 2 , which includes a microsphere spray device and a drying box 1. The microsphere spray device includes a spray box 2 connected to the drying box 1. A plurality of spray modules are provided on the top of the spray box 2. The spray modules include:

[0046] The spray disc 3 is installed on the top of the spray box 2;

[0047] The first nozzle 311 is located at the center of the spray disc 3 and is connected to a first slurry pipe 312. The first slurry pipe 312 transports the additive slurry at high pressure. The first slurry pipe 312 is connected to a first flow electromagnetic valve 81.

[0048] There are multiple second nozzles 321 located at the edge of the lower end surface of the spray disk 3. The multiple second nozzles 321 are distributed in an equally spaced circular array around the central axis of the spray disk 3. The second nozzles 321 are connected to a second slurry pipe 322. Kaolin slurry is transported at high pressure in the second slurry pipe 322. The second slurry pipe 322 is connected to a second flow solenoid valve 82. The spray direction of the second nozzles 321 is obliquely directed to the optimal spray diffusion layer of the first nozzle 311, and the droplets sprayed by the multiple second nozzles 321 just completely surround and cover the droplets sprayed by the first nozzle 311 at the optimal spray diffusion layer. Moreover, in the specific configuration, the ratio of the number of second nozzles 321 to the number of first nozzles 311 can be the ratio of the weight proportions of kaolin and additives; or, the first flow solenoid valve 81 and the second flow solenoid valve 82 are used to control the flow rate of the additive slurry and the total flow rate of the kaolin slurry respectively, so that the weight proportions of the additive and the weight proportions of kaolin sprayed simultaneously by the first nozzle 311 and multiple second nozzles 321 reach the set ratio to ensure that the ratio of the two meets the requirements.

[0049] The first annular electrode 41 and the insulating ring are provided at the mist outlet of the second nozzle 321.

[0050] The spring electrode 51 is insulated and sleeved at the mist outlet of the first nozzle 311, wherein the first nozzle 311 and the second nozzle 321 are both grounded; and

[0051] The electrostatic generator 6 is used to output high-voltage charges of different polarities to the first annular electrode 41 and the spring electrode 51, respectively. For example, in a specific embodiment, the first annular electrode 41 is supplied with a high-voltage positive charge, and the spring electrode 51 is supplied with a high-voltage negative charge. An insulating wall 9 is provided between the first annular electrode 41 and the spring electrode 51 to reduce interference in the electric field therebetween. The insulating wall 9 is made of insulating ceramic and its height is preferably such that it does not interfere with the flow of droplets sprayed from the second nozzle 321 to the first nozzle 311.

[0052] Specifically, refer to Figure 1 and Figure 2 The spring electrode 51 is configured as a conical coil spring, with its smallest inner diameter larger than the outer diameter of the first nozzle 311 and its largest inner diameter smaller than the diffusion diameter of the first nozzle 311 at its optimal spray diffusion layer. The axial length of the spring electrode 51 is smaller than the distance between the mist outlet of the first nozzle 311 and its optimal spray diffusion layer; the optimal spray diffusion layer refers to the area where the spray droplets are most evenly distributed.

[0053] In addition, the spray basin is provided with a vibration unit 52 for applying a vibration frequency close to the resonant frequency of the spring electrode 51. The vibration frequency can be equal to the resonant frequency of the spring electrode 51 or lower than the resonant frequency of the spring electrode 51. In the present embodiment, the vibration frequency is slightly lower than the vibration frequency of the spring electrode 51 to prevent the spring electrode 51 from experiencing metal fatigue due to long-term operation. The vibration unit 52 can be a mechanical vibrator or an electromagnetic vibrator, and the smallest inner diameter end of the spring electrode 51 is mounted on the output end of the vibration unit 52.

[0054] Therefore, when preparing kaolin spray microspheres, kaolin and deionized water are first evenly mixed into kaolin slurry, and then various additives with a set ratio are mixed with deionized water to form additive slurry. The kaolin slurry is passed into multiple second slurry pipes 322 at high pressure, and the additive slurry is passed into the first slurry pipe 312 at high pressure. The flow rate of droplets sprayed from the first nozzle 311 and the second nozzle 321 is controlled by the first flow solenoid valve 81 and the second flow solenoid valve 82, so that when the first nozzle 311 sprays the additive slurry, the multiple surrounding second nozzles 321 also spray the kaolin slurry, so that efficient mixing can be achieved while ensuring the ratio of the additive slurry and the kaolin slurry.

[0055] At the same time, when the electrostatic generator 6 is working, it outputs high-voltage positive charge to the first annular electrode 41 and high-voltage negative charge to the spring electrode 51, so that the auxiliary agent droplets sprayed from the first nozzle 311 are negatively charged, and the kaolin droplets sprayed from the second nozzle 321 are positively charged. In this way, the auxiliary agent droplets and the kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and auxiliary agents; and since the two are mixed in the form of droplets, the mixing uniformity of the two can be greatly promoted.

[0056] Moreover, since the spring electrode 51 is configured as a conical coil spring, its cone shape is close to the diffusion model of the auxiliary agent droplets sprayed from the first nozzle 311, so that the spring electrode 51 can charge the auxiliary agent droplets more evenly; at the same time, high-frequency vibration is applied to the spring electrode 51 with the help of the vibration unit 52, so that the spring electrode 51 can not only charge the auxiliary agent droplets, but also further add oblique kinetic energy to the auxiliary agent droplets, improve the uniformity of the auxiliary agent droplets, and make the auxiliary agent droplets have sufficient kinetic energy to diffuse to the surrounding side, so as to further promote the capture and combination of the auxiliary agent droplets and the kaolin droplets on the surrounding side.

[0057] At the same time, in order to cooperate with the diffusion effect of the auxiliary agent droplets to the surrounding side under the action of the vibration unit 52, a second annular electrode 42 corresponding to the optimal spray diffusion layer of the first nozzle 311 is also provided in the spray box 2. The inner diameter of the second annular electrode 42 is larger than the outer diameter of the spray disk 3. The second annular electrode 42 is connected to the electrostatic generator 6 and the electrostatic generator 6 outputs a high-voltage charge with the same polarity as the high-voltage charge on the first annular electrode 41, such as the high-voltage positive charge described above.

[0058] In this way, under the action of the electric field of the second annular electrode 42, a repulsive force will be applied to the positively charged kaolin droplets surrounding the auxiliary agent droplets, so that the kaolin droplets sprayed from the second nozzle 321 tend to move closer to the auxiliary agent droplets, thereby further promoting the mixing efficiency of the kaolin droplets and the auxiliary agent droplets.

[0059] In addition, the spray diffusion angle of the second nozzle 321 is smaller than the spray diffusion angle of the first nozzle 311 to ensure the uniformity of mixing of the kaolin droplets and the additive droplets; and the first annular electrode 41 is conical, and its closing end is close to the second nozzle 321 to match the conical distribution of droplets sprayed from the first nozzle 311 as much as possible, thereby ensuring the uniformity of the charge loading of the kaolin droplets by the first annular electrode 41.

[0060] At the same time, refer to Figure 1 and Figure 2 To prevent the hot air in drying box 1 from significantly interfering with the mixing of the kaolin and additive droplets, in another feasible embodiment, an air guide cone 7, with its closed end extending into drying box 1, is provided at the junction of spray box 2 and drying box 1. The closed end inner diameter of air guide cone 7 is smaller than the outer diameter of spray disk 3. Thus, under the influence of air guide cone 7, the probability of hot air in drying box 1 surging into spray box 2 is reduced, and it will not significantly interfere with the mixing of the kaolin and additive droplets.

[0061] The present application discloses a method for preparing an in-situ crystallization catalyst, based on the above-mentioned in-situ crystallization catalyst production line, referring to Figure 1 , which includes the following steps:

[0062] S1. The kaolin is mixed with deionized water to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry;

[0063] S2. The kaolin slurry is passed under high pressure into the plurality of second nozzles 321, and the additive slurry is passed under high pressure into the first nozzle 311. The spray flow rate ratio of the plurality of second nozzles 321 to the first nozzle 311 is controlled according to the ratio of kaolin to additive. Kaolin spray microspheres are prepared in the spray box 2, dried in the drying oven 1, calcined, and crystallized by mixing with a silicon source, an alkaline solution, and a directing agent. The filter cake is filtered, washed, and dried to obtain an in-situ crystallized product.

[0064] S3. exchanging and calcining the in-situ crystallization product with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

[0065] Among them, in step S2, the first nozzle 311 and the multiple second nozzles 321 spray out auxiliary agent droplets and kaolin droplets respectively, and then use the spring electrode 51 and the first annular electrode 41 to apply different charges to the auxiliary agent droplets and kaolin droplets, which can promote the mixing efficiency and mixing uniformity of the two.

[0066] The embodiments of the present application disclose an in-situ crystallization catalyst, which is prepared by the above-mentioned in-situ crystallization catalyst preparation method.

[0067] The implementation principle of an in-situ crystallization catalyst production line in the embodiment of the present application is as follows:

[0068] When preparing kaolin spray microspheres, kaolin and deionized water are first uniformly mixed into a kaolin slurry, and then various additives with a set ratio are mixed with deionized water to form an additive slurry. The kaolin slurry is passed into multiple second slurry pipes 322 at high pressure, and the additive slurry is passed into the first slurry pipe 312 at high pressure. The flow rate of droplets sprayed from the first nozzle 311 and the second nozzle 321 is controlled by the first flow solenoid valve 81 and the second flow solenoid valve 82, so that when the first nozzle 311 sprays the additive slurry, the multiple surrounding second nozzles 321 also spray the kaolin slurry.

[0069] At the same time, when the electrostatic generator 6 is working, it outputs high-voltage positive charge to the first annular electrode 41 and high-voltage negative charge to the spring electrode 51, so that the auxiliary agent droplets sprayed from the first nozzle 311 are negatively charged, and the kaolin droplets sprayed from the second nozzle 321 are positively charged. In this way, the auxiliary agent droplets and the kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and auxiliary agents; and since the two are mixed in the form of droplets, the mixing uniformity of the two can be greatly promoted.

[0070] Moreover, since the spring electrode 51 is configured as a conical coil spring, its cone shape is close to the diffusion model of the auxiliary agent droplets sprayed from the first nozzle 311, so that the spring electrode 51 can charge the auxiliary agent droplets more evenly; at the same time, high-frequency vibration is applied to the spring electrode 51 with the help of the vibration unit 52, so that the spring electrode 51 can not only charge the auxiliary agent droplets, but also further add oblique kinetic energy to the auxiliary agent droplets, improve the uniformity of the auxiliary agent droplets, and make the auxiliary agent droplets have sufficient kinetic energy to diffuse to the surrounding side, so as to further promote the capture and combination of the auxiliary agent droplets and the kaolin droplets on the surrounding side.

[0071] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0072] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An in-situ crystallization catalyst production line, comprising a microsphere spray device and a drying oven (1), characterized in that: The microsphere spray device comprises a spray box (2) connected to the drying box (1), and a plurality of spray modules are arranged on the top of the spray box (2), and the spray modules include: A spray disc (3) is mounted on the top of the spray box (2); A first nozzle (311) is provided at the center of the spray disc (3) and is connected to a first slurry pipe (312), wherein the first slurry pipe (312) transports an auxiliary agent slurry at high pressure; A plurality of second nozzles (321) are provided and located at the edge of the spray disc (3), the plurality of second nozzles (321) are distributed in an evenly spaced circular array about the central axis of the spray disc (3), the second nozzles (321) are connected to a second slurry pipe (322), kaolin slurry is transported in the second slurry pipe (322) under high pressure, and the spray direction of the second nozzles (321) is obliquely directed toward the optimal spray diffusion layer of the first nozzle (311); The first annular electrode (41) and the insulating ring are provided at the mist outlet of the second nozzle (321). a spring electrode (51) which is insulated and sleeved at the mist outlet of the first nozzle (311); and an electrostatic generator (6) for outputting high-voltage charges of different polarities to the first annular electrode (41) and the spring electrode (51); The spring electrode (51) is configured as a conical helical spring, and its minimum inner diameter end is larger than the outer diameter of the first nozzle (311), and its maximum inner diameter is smaller than the diffusion diameter of the first nozzle (311) at its optimal spray diffusion layer; the spray disc (3) is provided with a vibration unit (52) for applying a vibration frequency close to its resonant frequency to the spring electrode (51).

2. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The axial length of the spring electrode (51) is less than the distance between the mist outlet of the first nozzle (311) and its optimal spray diffusion layer.

3. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The spray box (2) is provided with a second annular electrode (42) corresponding to the optimal spray diffusion layer of the first nozzle (311), the inner diameter of the second annular electrode (42) is larger than the outer diameter of the spray disk (3), and the second annular electrode (42) is connected to the electrostatic generator (6) and outputs a high-voltage charge having the same polarity as the high-voltage charge on the first annular electrode (41) by the electrostatic generator (6).

4. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The spray diffusion angle of the second nozzle (321) is smaller than the spray diffusion angle of the first nozzle (311).

5. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The first annular electrode (41) is in the shape of a cone, and its closing end is close to the second nozzle (321).

6. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The joint between the spray box (2) and the drying box (1) is provided with an air guide cone (7) with a closed end extending into the drying box (1).

7. A method for preparing an in-situ crystallization catalyst, based on an in-situ crystallization catalyst production line according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The kaolin is mixed with deionized water to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry; S2. The kaolin slurry is passed through the plurality of second nozzles (321) under high pressure, and the auxiliary agent slurry is passed through the first nozzle (311) under high pressure, and the spray flow rate ratio of the plurality of second nozzles (321) and the first nozzle (311) is controlled according to the ratio of kaolin to auxiliary agent, and kaolin spray microspheres are prepared in the spray box (2), dried in the drying box (1), and then calcined, and crystallized by mixing with a silicon source, an alkaline solution, and a directing agent. The filter cake is filtered, washed, and dried to obtain an in-situ crystallized product; S3. exchanging and calcining the in-situ crystallization product with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

8. An in-situ crystallization catalyst, characterized in that The catalyst is prepared by the in-situ crystallization catalyst preparation method as claimed in claim 7.

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